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Version:
3.2.0 ▾
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unit Unzip;
{$mode tp}
{ ----------------------------------------------------------------- }
{ unzip.c -- IO on .zip files using zlib
Version 0.15 beta, Mar 19th, 1998,
unzip.h -- IO for uncompress .zip files using zlib
Version 0.15 beta, Mar 19th, 1998,
Copyright (C) 1998 Gilles Vollant <info@winimage.com>
http://www.winimage.com/zLibDll/zip.htm
This unzip package allow extract file from .ZIP file, compatible
with PKZip 2.04g, WinZip, InfoZip tools and compatible.
Encryption and multi volume ZipFile (span) are not supported.
Old compressions used by old PKZip 1.x are not supported
Pascal tranlastion
Copyright (C) 2000 by Jacques Nomssi Nzali
For conditions of distribution and use, see copyright notice in readme.txt }
interface
{$ifdef WIN32}
{$define Delphi}
{$endif}
uses
//zutil,
zbase,
//zLib,
ziputils;
const
UNZ_OK = (0);
UNZ_END_OF_LIST_OF_FILE = (-100);
UNZ_ERRNO = (Z_ERRNO);
UNZ_EOF = (0);
UNZ_PARAMERROR = (-102);
UNZ_BADZIPFILE = (-103);
UNZ_INTERNALERROR = (-104);
UNZ_CRCERROR = (-105);
(*
{ tm_unz contain date/time info }
type
tm_unz = record
tm_sec : integer; { seconds after the minute - [0,59] }
tm_min : integer; { minutes after the hour - [0,59] }
tm_hour : integer; { hours since midnight - [0,23] }
tm_mday : integer; { day of the month - [1,31] }
tm_mon : integer; { months since January - [0,11] }
tm_year : integer; { years - [1980..2044] }
end;
*)
{ unz_global_info structure contain global data about the ZIPfile
These data comes from the end of central dir }
type
unz_global_info = record
number_entry: longint; { total number of entries in
the central dir on this disk }
size_comment: longint; { size of the global comment of the zipfile }
end;
{ unz_file_info contain information about a file in the zipfile }
type
unz_file_info = record
version: longint; { version made by 2 bytes }
version_needed: longint; { version needed to extract 2 bytes }
flag: longint; { general purpose bit flag 2 bytes }
compression_method: longint; { compression method 2 bytes }
dosDate: longint; { last mod file date in Dos fmt 4 bytes }
crc: longint; { crc-32 4 bytes }
compressed_size: longint; { compressed size 4 bytes }
uncompressed_size: longint; { uncompressed size 4 bytes }
size_filename: longint; { filename length 2 bytes }
size_file_extra: longint; { extra field length 2 bytes }
size_file_comment: longint; { file comment length 2 bytes }
disk_num_start: longint; { disk number start 2 bytes }
internal_fa: longint; { internal file attributes 2 bytes }
external_fa: longint; { external file attributes 4 bytes }
tmu_date: tm_unz;
end;
unz_file_info_ptr = ^unz_file_info;
function unzStringFileNameCompare(const fileName1: PChar; const fileName2: PChar; iCaseSensitivity: longint): longint;
{ Compare two filename (fileName1,fileName2).
If iCaseSenisivity = 1 (1=true),
comparision is case sensitive (like strcmp)
If iCaseSenisivity = 2 (0=false),
comparision is not case sensitive (like strcmpi or strcasecmp)
If iCaseSenisivity = 0, case sensitivity is defaut of your
operating system like 1 on Unix, 2 on Windows)
}
function unzOpen(const path: PChar): unzFile;
{ Open a Zip file. path contain the full pathname (by example,
on a Windows NT computer "c:\\zlib\\zlib111.zip" or on an Unix computer
"zlib/zlib111.zip".
If the zipfile cannot be opened (file don't exist or in not valid), the
return value is NIL.
Else, the return value is a unzFile Handle, usable with other function
of this unzip package.
}
function unzClose(afile: unzFile): longint;
{ Close a ZipFile opened with unzipOpen.
If there are files inside the .Zip opened with unzOpenCurrentFile()
(see later), these files MUST be closed with unzipCloseCurrentFile()
before a call unzipClose.
return UNZ_OK if there is no problem. }
function unzGetGlobalInfo(afile: unzFile; var pglobal_info: unz_global_info): longint;
{ Write info about the ZipFile in the *pglobal_info structure.
No preparation of the structure is needed
return UNZ_OK if there is no problem. }
function unzGetGlobalComment(afile: unzFile; szComment: PChar; uSizeBuf: longint): longint;
{ Get the global comment string of the ZipFile, in the szComment buffer.
uSizeBuf is the size of the szComment buffer.
return the number of byte copied or an error code <0 }
{***************************************************************************}
{ Unzip package allow you browse the directory of the zipfile }
function unzGoToFirstFile(afile: unzFile): longint;
{ Set the current file of the zipfile to the first file.
return UNZ_OK if there is no problem }
function unzGoToNextFile(afile: unzFile): longint;
{ Set the current file of the zipfile to the next file.
return UNZ_OK if there is no problem
return UNZ_END_OF_LIST_OF_FILE if the actual file was the latest. }
function unzLocateFile(afile: unzFile; const szFileName: PChar; iCaseSensitivity: longint): longint; { ZEXPORT }
{ Try locate the file szFileName in the zipfile.
For the iCaseSensitivity signification, see unzStringFileNameCompare
return value :
UNZ_OK if the file is found. It becomes the current file.
UNZ_END_OF_LIST_OF_FILE if the file is not found }
function unzGetCurrentFileInfo(afile: unzFile; pfile_info: unz_file_info_ptr; szFileName: PChar; fileNameBufferSize: longint; extraField: pointer; extraFieldBufferSize: longint; szComment: PChar; commentBufferSize: longint): longint; { ZEXPORT }
{ Get Info about the current file
if pfile_info<>NIL, the pfile_info^ structure will contain somes
info about the current file
if szFileName<>NIL, the filemane string will be copied in szFileName
(fileNameBufferSize is the size of the buffer)
if extraField<>NIL, the extra field information will be copied in
extraField (extraFieldBufferSize is the size of the buffer).
This is the Central-header version of the extra field
if szComment<>NIL, the comment string of the file will be copied in
szComment (commentBufferSize is the size of the buffer) }
{***************************************************************************}
{* for reading the content of the current zipfile, you can open it, read data
from it, and close it (you can close it before reading all the file) }
function unzOpenCurrentFile(afile: unzFile): longint; { ZEXPORT }
{ Open for reading data the current file in the zipfile.
If there is no error, the return value is UNZ_OK. }
function unzCloseCurrentFile(afile: unzFile): longint; { ZEXPORT }
{ Close the file in zip opened with unzOpenCurrentFile
Return UNZ_CRCERROR if all the file was read but the CRC is not good }
function unzReadCurrentFile(afile: unzFile; buf: pointer; len: cardinal): longint; { ZEXPORT }
{ Read bytes from the current file (opened by unzOpenCurrentFile)
buf contain buffer where data must be copied
len the size of buf.
return the number of byte copied if somes bytes are copied
return 0 if the end of file was reached
return <0 with error code if there is an error
(UNZ_ERRNO for IO error, or zLib error for uncompress error) }
function unztell(afile: unzFile): z_off_t;
{ Give the current position in uncompressed data }
function unzeof(afile: unzFile): longint;
{ return 1 if the end of file was reached, 0 elsewhere
! checks for valid params }
function unzGetLocalExtrafield(afile: unzFile; buf: pointer; len: cardinal): longint;
{ Read extra field from the current file (opened by unzOpenCurrentFile)
This is the local-header version of the extra field (sometimes, there is
more info in the local-header version than in the central-header)
if buf=NIL, it return the size of the local extra field
if buf<>NIL, len is the size of the buffer, the extra header is copied in
buf.
the return value is the number of bytes copied in buf, or (if <0)
the error code }
{ ----------------------------------------------------------------- }
implementation
uses
{$ifdef Delphi}
SysUtils,
{$else}
strings,
{$endif}
zInflate, crc;
{$ifdef unix and not def (CASESENSITIVITYDEFAULT_YES) and \
!defined(CASESENSITIVITYDEFAULT_NO)}
{$define CASESENSITIVITYDEFAULT_NO}
{$endif}
const
UNZ_BUFSIZE = Z_BUFSIZE;
UNZ_MAXFILENAMEINZIP = Z_MAXFILENAMEINZIP;
const
unz_copyright: PChar = ' unzip 0.15 Copyright 1998 Gilles Vollant ';
{ unz_file_info_internal contain internal info about a file in zipfile }
type
unz_file_info_internal = record
offset_curfile: longint; { relative offset of local header 4 bytes }
end;
unz_file_info_internal_ptr = ^unz_file_info_internal;
{ file_in_zip_read_info_s contain internal information about a file
in zipfile, when reading and decompress it }
type
file_in_zip_read_info_s = record
read_buffer: PChar; { internal buffer for compressed data }
stream: z_stream; { zLib stream structure for inflate }
pos_in_zipfile: longint; { position in byte on the zipfile, for fseek}
stream_initialised: boolean; { flag set if stream structure is initialised}
offset_local_extrafield: longint; { offset of the local extra field }
size_local_extrafield: smallint; { size of the local extra field }
pos_local_extrafield: longint; { position in the local extra field in read}
crc32: longint; { crc32 of all data uncompressed }
crc32_wait: longint; { crc32 we must obtain after decompress all }
rest_read_compressed: longint; { number of byte to be decompressed }
rest_read_uncompressed: longint; {number of byte to be obtained after decomp}
afile: FILEptr; { io structure of the zipfile }
compression_method: longint; { compression method (0=store) }
byte_before_the_zipfile: longint; { byte before the zipfile, (>0 for sfx) }
end;
file_in_zip_read_info_s_ptr = ^file_in_zip_read_info_s;
{ unz_s contain internal information about the zipfile }
type
unz_s = record
afile: FILEptr; { io structore of the zipfile }
gi: unz_global_info; { public global information }
byte_before_the_zipfile: longint; { byte before the zipfile, (>0 for sfx)}
num_file: longint; { number of the current file in the zipfile}
pos_in_central_dir: longint; { pos of the current file in the central dir}
current_file_ok: boolean; { flag about the usability of the current file}
central_pos: longint; { position of the beginning of the central dir}
size_central_dir: longint; { size of the central directory }
offset_central_dir: longint; { offset of start of central directory with
respect to the starting disk number }
cur_file_info: unz_file_info; { public info about the current file in zip}
cur_file_info_internal: unz_file_info_internal; { private info about it}
pfile_in_zip_read: file_in_zip_read_info_s_ptr; { structure about the current
file if we are decompressing it }
end;
unz_s_ptr = ^unz_s;
{ ===========================================================================
Read a byte from a gz_stream; update next_in and avail_in. Return EOF
for end of file.
IN assertion: the stream s has been sucessfully opened for reading. }
function unzlocal_getByte(fin: FILEptr; var pi: longint): longint;
var
c: byte;
err: longint;
begin
err := fread(@c, 1, 1, fin);
if (err = 1) then
begin
pi := longint(c);
unzlocal_getByte := UNZ_OK;
{exit;}
end
else
if feof(fin) = 1 then {if ferror(fin) then}
unzlocal_getByte := UNZ_ERRNO
else
unzlocal_getByte := UNZ_EOF{exit;};
end;
{ ===========================================================================
Reads a long in LSB order from the given gz_stream. Sets }
function unzlocal_getShort(fin: FILEptr; var pX: longint): longint;
var
x: longint;
i: longint;
err: longint;
begin
err := unzlocal_getByte(fin, i);
x := longint(i);
if (err = UNZ_OK) then
err := unzlocal_getByte(fin, i);
Inc(x, longint(i) shl 8);
if (err = UNZ_OK) then
pX := x
else
pX := 0;
unzlocal_getShort := err;
end;
function unzlocal_getLong(fin: FILEptr; var pX: longint): longint;
var
x: longint;
i: longint;
err: longint;
begin
err := unzlocal_getByte(fin, i);
x := longint(i);
if (err = UNZ_OK) then
err := unzlocal_getByte(fin, i);
Inc(x, longint(i) shl 8);
if (err = UNZ_OK) then
err := unzlocal_getByte(fin, i);
Inc(x, longint(i) shl 16);
if (err = UNZ_OK) then
err := unzlocal_getByte(fin, i);
Inc(x, longint(i) shl 24);
if (err = UNZ_OK) then
pX := x
else
pX := 0;
unzlocal_getLong := err;
end;
{ My own strcmpi / strcasecmp }
function strcmpcasenosensitive_internal(fileName1: PChar; fileName2: PChar): longint;
var
c1, c2: char;
begin
repeat
c1 := fileName1^;
Inc(fileName1);
c2 := fileName2^;
Inc(fileName2);
if (c1 >= 'a') and (c1 <= 'z') then
Dec(c1, $20);
if (c2 >= 'a') and (c2 <= 'z') then
Dec(c2, $20);
if (c1 = #0) then
begin
if c2 = #0 then
strcmpcasenosensitive_internal := 0
else
strcmpcasenosensitive_internal := -1;
exit;
end;
if (c2 = #0) then
begin
strcmpcasenosensitive_internal := 1;
exit;
end;
if (c1 < c2) then
begin
strcmpcasenosensitive_internal := -1;
exit;
end;
if (c1 > c2) then
begin
strcmpcasenosensitive_internal := 1;
exit;
end;
until False;
end;
const
CASESENSITIVITYDEFAULTVALUE = 2;
function unzStringFileNameCompare(const fileName1: PChar; const fileName2: PChar; iCaseSensitivity: longint): longint; { ZEXPORT }
{ Compare two filename (fileName1,fileName2).
If iCaseSenisivity = 1 (1=true),
comparision is case sensitive (like strcmp)
If iCaseSenisivity = 2 (0=false),
comparision is not case sensitive (like strcmpi or strcasecmp)
If iCaseSenisivity = 0, case sensitivity is defaut of your
operating system like 1 on Unix, 2 on Windows)
}
begin
if (iCaseSensitivity = 0) then
iCaseSensitivity := CASESENSITIVITYDEFAULTVALUE;
if (iCaseSensitivity = 1) then
begin
unzStringFileNameCompare := strComp(fileName1, fileName2);
exit;
end;
unzStringFileNameCompare := strcmpcasenosensitive_internal(fileName1, fileName2);
end;
const
BUFREADCOMMENT = $400;
{ Locate the Central directory of a zipfile (at the end, just before
the global comment) }
function unzlocal_SearchCentralDir(fin: FILEptr): longint;
var
buf: Pbytearray;
uSizeFile: longint;
uBackRead: longint;
uMaxBack: longint;
uPosFound: longint;
var
uReadSize, uReadPos: longint;
i: longint;
begin
uMaxBack := $ffff; { maximum size of global comment }
uPosFound := 0;
if (fseek(fin, 0, SEEK_END) <> 0) then
begin
unzlocal_SearchCentralDir := 0;
exit;
end;
uSizeFile := ftell(fin);
if (uMaxBack > uSizeFile) then
uMaxBack := uSizeFile;
buf := Pbytearray(AllocMem(BUFREADCOMMENT + 4));
if (buf = nil) then
begin
unzlocal_SearchCentralDir := 0;
exit;
end;
uBackRead := 4;
while (uBackRead < uMaxBack) do
begin
if (uBackRead + BUFREADCOMMENT > uMaxBack) then
uBackRead := uMaxBack
else
Inc(uBackRead, BUFREADCOMMENT);
uReadPos := uSizeFile - uBackRead;
if ((BUFREADCOMMENT + 4) < (uSizeFile - uReadPos)) then
uReadSize := (BUFREADCOMMENT + 4)
else
uReadSize := (uSizeFile - uReadPos);
if fseek(fin, uReadPos, SEEK_SET) <> 0 then
break;
if fread(buf, uReadSize, 1, fin) <> 1 then
break;
i := uReadSize - 3;
while (i > 0) do
begin
Dec(i);
if (buf^[i] = $50) and (buf^[i + 1] = $4b) and { ENDHEADERMAGIC }
(buf^[i + 2] = $05) and (buf^[i + 3] = $06) then
begin
uPosFound := uReadPos + i;
break;
end;
end;
if (uPosFound <> 0) then
break;
end;
FreeMem(buf);
unzlocal_SearchCentralDir := uPosFound;
end;
{ Open a Zip file. path contain the full pathname (by example,
on a Windows NT computer "c:\\zlib\\zlib111.zip" or on an Unix computer
"zlib/zlib111.zip".
If the zipfile cannot be opened (file don't exist or in not valid), the
return value is NIL.
Else, the return value is a unzFile Handle, usable with other function
of this unzip package.
}
function unzOpen(const path: PChar): unzFile; { ZEXPORT }
var
us: unz_s;
s: unz_s_ptr;
central_pos, uL: longint;
fin: FILEptr;
number_disk: longint; { number of the current dist, used for spaning ZIP,
unsupported, always 0 }
number_disk_with_CD: longint; { number the the disk with central dir,
used for spaning ZIP, unsupported, always 0 }
number_entry_CD: longint; { total number of entries in the central dir
(same than number_entry on nospan) }
err: longint;
begin
err := UNZ_OK;
if (unz_copyright[0] <> ' ') then
begin
unzOpen := nil;
exit;
end;
fin := fopen(path, fopenread);
if (fin = nil) then
begin
unzOpen := nil;
exit;
end;
central_pos := unzlocal_SearchCentralDir(fin);
if (central_pos = 0) then
err := UNZ_ERRNO;
if (fseek(fin, central_pos, SEEK_SET) <> 0) then
err := UNZ_ERRNO;
{ the signature, already checked }
if (unzlocal_getLong(fin, uL) <> UNZ_OK) then
err := UNZ_ERRNO;
{ number of this disk }
if (unzlocal_getShort(fin, number_disk) <> UNZ_OK) then
err := UNZ_ERRNO;
{ number of the disk with the start of the central directory }
if (unzlocal_getShort(fin, number_disk_with_CD) <> UNZ_OK) then
err := UNZ_ERRNO;
{ total number of entries in the central dir on this disk }
if (unzlocal_getShort(fin, us.gi.number_entry) <> UNZ_OK) then
err := UNZ_ERRNO;
{ total number of entries in the central dir }
if (unzlocal_getShort(fin, number_entry_CD) <> UNZ_OK) then
err := UNZ_ERRNO;
if ((number_entry_CD <> us.gi.number_entry) or
(number_disk_with_CD <> 0) or
(number_disk <> 0)) then
err := UNZ_BADZIPFILE;
{ size of the central directory }
if (unzlocal_getLong(fin, us.size_central_dir) <> UNZ_OK) then
err := UNZ_ERRNO;
{ offset of start of central directory with respect to the
starting disk number }
if (unzlocal_getLong(fin, us.offset_central_dir) <> UNZ_OK) then
err := UNZ_ERRNO;
{ zipfile comment length }
if (unzlocal_getShort(fin, us.gi.size_comment) <> UNZ_OK) then
err := UNZ_ERRNO;
if ((central_pos < us.offset_central_dir + us.size_central_dir) and
(err = UNZ_OK)) then
err := UNZ_BADZIPFILE;
if (err <> UNZ_OK) then
begin
fclose(fin);
unzOpen := nil;
exit;
end;
us.afile := fin;
us.byte_before_the_zipfile := central_pos -
(us.offset_central_dir + us.size_central_dir);
us.central_pos := central_pos;
us.pfile_in_zip_read := nil;
s := unz_s_ptr(AllocMem(sizeof(unz_s)));
s^ := us;
unzGoToFirstFile(unzFile(s));
unzOpen := unzFile(s);
end;
{ Close a ZipFile opened with unzipOpen.
If there are files inside the .Zip opened with unzOpenCurrentFile()
(see later), these files MUST be closed with unzipCloseCurrentFile()
before a call unzipClose.
return UNZ_OK if there is no problem. }
function unzClose(afile: unzFile): longint; { ZEXPORT }
var
s: unz_s_ptr;
begin
if (afile = nil) then
begin
unzClose := UNZ_PARAMERROR;
exit;
end;
s := unz_s_ptr(afile);
if (s^.pfile_in_zip_read <> nil) then
unzCloseCurrentFile(afile);
fclose(s^.afile);
FreeMem(s);
unzClose := UNZ_OK;
end;
{ Write info about the ZipFile in the pglobal_info structure.
No preparation of the structure is needed
return UNZ_OK if there is no problem. }
function unzGetGlobalInfo(afile: unzFile; var pglobal_info: unz_global_info): longint; { ZEXPORT }
var
s: unz_s_ptr;
begin
if (afile = nil) then
begin
unzGetGlobalInfo := UNZ_PARAMERROR;
exit;
end;
s := unz_s_ptr(afile);
pglobal_info := s^.gi;
unzGetGlobalInfo := UNZ_OK;
end;
{ Translate date/time from Dos format to tm_unz (more easily readable) }
procedure unzlocal_DosDateToTmuDate(ulDosDate: longint; var ptm: tm_unz);
var
uDate: longint;
begin
uDate := longint(ulDosDate shr 16);
ptm.tm_mday := integer(uDate and $1f);
ptm.tm_mon := integer((((uDate) and $1E0) div $20) - 1);
ptm.tm_year := integer(((uDate and $0FE00) div $0200) + 1980);
ptm.tm_hour := integer((ulDosDate and $F800) div $800);
ptm.tm_min := integer((ulDosDate and $7E0) div $20);
ptm.tm_sec := integer(2 * (ulDosDate and $1f));
end;
{ Get Info about the current file in the zipfile, with internal only info }
function unzlocal_GetCurrentFileInfoInternal(afile: unzFile; pfile_info: unz_file_info_ptr; pfile_info_internal: unz_file_info_internal_ptr; szFileName: PChar; fileNameBufferSize: longint; extraField: pointer; extraFieldBufferSize: longint; szComment: PChar; commentBufferSize: longint): longint;
var
s: unz_s_ptr;
file_info: unz_file_info;
file_info_internal: unz_file_info_internal;
err: longint;
uMagic: longint;
lSeek: longint;
var
uSizeRead: longint;
begin
err := UNZ_OK;
lSeek := 0;
if (afile = nil) then
begin
unzlocal_GetCurrentFileInfoInternal := UNZ_PARAMERROR;
exit;
end;
s := unz_s_ptr(afile);
if (fseek(s^.afile,
s^.pos_in_central_dir + s^.byte_before_the_zipfile, SEEK_SET) <> 0) then
err := UNZ_ERRNO;
{ we check the magic }
if (err = UNZ_OK) then
if (unzlocal_getLong(s^.afile, uMagic) <> UNZ_OK) then
err := UNZ_ERRNO
else
if (uMagic <> CENTRALHEADERMAGIC) then
err := UNZ_BADZIPFILE;
if (unzlocal_getShort(s^.afile, file_info.version) <> UNZ_OK) then
err := UNZ_ERRNO;
if (unzlocal_getShort(s^.afile, file_info.version_needed) <> UNZ_OK) then
err := UNZ_ERRNO;
if (unzlocal_getShort(s^.afile, file_info.flag) <> UNZ_OK) then
err := UNZ_ERRNO;
if (unzlocal_getShort(s^.afile, file_info.compression_method) <> UNZ_OK) then
err := UNZ_ERRNO;
if (unzlocal_getLong(s^.afile, file_info.dosDate) <> UNZ_OK) then
err := UNZ_ERRNO;
unzlocal_DosDateToTmuDate(file_info.dosDate, file_info.tmu_date);
if (unzlocal_getLong(s^.afile, file_info.crc) <> UNZ_OK) then
err := UNZ_ERRNO;
if (unzlocal_getLong(s^.afile, file_info.compressed_size) <> UNZ_OK) then
err := UNZ_ERRNO;
if (unzlocal_getLong(s^.afile, file_info.uncompressed_size) <> UNZ_OK) then
err := UNZ_ERRNO;
if (unzlocal_getShort(s^.afile, file_info.size_filename) <> UNZ_OK) then
err := UNZ_ERRNO;
if (unzlocal_getShort(s^.afile, file_info.size_file_extra) <> UNZ_OK) then
err := UNZ_ERRNO;
if (unzlocal_getShort(s^.afile, file_info.size_file_comment) <> UNZ_OK) then
err := UNZ_ERRNO;
if (unzlocal_getShort(s^.afile, file_info.disk_num_start) <> UNZ_OK) then
err := UNZ_ERRNO;
if (unzlocal_getShort(s^.afile, file_info.internal_fa) <> UNZ_OK) then
err := UNZ_ERRNO;
if (unzlocal_getLong(s^.afile, file_info.external_fa) <> UNZ_OK) then
err := UNZ_ERRNO;
if (unzlocal_getLong(s^.afile, file_info_internal.offset_curfile) <> UNZ_OK) then
err := UNZ_ERRNO;
Inc(lSeek, file_info.size_filename);
if ((err = UNZ_OK) and (szFileName <> nil)) then
begin
if (file_info.size_filename < fileNameBufferSize) then
begin
(szFileName +file_info.size_filename)^ := #0;
uSizeRead := file_info.size_filename;
end
else
uSizeRead := fileNameBufferSize;
if (file_info.size_filename > 0) and (fileNameBufferSize > 0) then
if fread(szFileName, uSizeRead, 1, s^.afile) <> 1 then
err := UNZ_ERRNO;
Dec(lSeek, uSizeRead);
end;
if ((err = UNZ_OK) and (extraField <> nil)) then
begin
if (file_info.size_file_extra < extraFieldBufferSize) then
uSizeRead := file_info.size_file_extra
else
uSizeRead := extraFieldBufferSize;
if (lSeek <> 0) then
if (fseek(s^.afile, lSeek, SEEK_CUR) = 0) then
lSeek := 0
else
err := UNZ_ERRNO;
if ((file_info.size_file_extra > 0) and (extraFieldBufferSize > 0)) then
if fread(extraField, uSizeRead, 1, s^.afile) <> 1 then
err := UNZ_ERRNO;
Inc(lSeek, file_info.size_file_extra - uSizeRead);
end
else
Inc(lSeek, file_info.size_file_extra);
if ((err = UNZ_OK) and (szComment <> nil)) then
begin
if (file_info.size_file_comment < commentBufferSize) then
begin
(szComment +file_info.size_file_comment)^ := #0;
uSizeRead := file_info.size_file_comment;
end
else
uSizeRead := commentBufferSize;
if (lSeek <> 0) then
if (fseek(s^.afile, lSeek, SEEK_CUR) = 0) then
lSeek := 0
else
err := UNZ_ERRNO;
if ((file_info.size_file_comment > 0) and (commentBufferSize > 0)) then
if fread(szComment, uSizeRead, 1, s^.afile) <> 1 then
err := UNZ_ERRNO;
Inc(lSeek, file_info.size_file_comment - uSizeRead);
end
else
Inc(lSeek, file_info.size_file_comment);
if ((err = UNZ_OK) and (pfile_info <> nil)) then
pfile_info^ := file_info;
if ((err = UNZ_OK) and (pfile_info_internal <> nil)) then
pfile_info_internal^ := file_info_internal;
unzlocal_GetCurrentFileInfoInternal := err;
end;
{ Write info about the ZipFile in the *pglobal_info structure.
No preparation of the structure is needed
return UNZ_OK if there is no problem. }
function unzGetCurrentFileInfo(afile: unzFile; pfile_info: unz_file_info_ptr; szFileName: PChar; fileNameBufferSize: longint; extraField: pointer; extraFieldBufferSize: longint; szComment: PChar; commentBufferSize: longint): longint; { ZEXPORT }
{ Get Info about the current file
if pfile_info<>NIL, the pfile_info^ structure will contain somes
info about the current file
if szFileName<>NIL, the filemane string will be copied in szFileName
(fileNameBufferSize is the size of the buffer)
if extraField<>NIL, the extra field information will be copied in
extraField (extraFieldBufferSize is the size of the buffer).
This is the Central-header version of the extra field
if szComment<>NIL, the comment string of the file will be copied in
szComment (commentBufferSize is the size of the buffer) }
begin
unzGetCurrentFileInfo := unzlocal_GetCurrentFileInfoInternal(afile,
pfile_info, nil, szFileName, fileNameBufferSize, extraField,
extraFieldBufferSize, szComment, commentBufferSize);
end;
{ Set the current file of the zipfile to the first file.
return UNZ_OK if there is no problem }
function unzGoToFirstFile(afile: unzFile): longint; { ZEXPORT }
var
err: longint;
s: unz_s_ptr;
begin
if (afile = nil) then
begin
unzGoToFirstFile := UNZ_PARAMERROR;
exit;
end;
s := unz_s_ptr(afile);
s^.pos_in_central_dir := s^.offset_central_dir;
s^.num_file := 0;
err := unzlocal_GetCurrentFileInfoInternal(afile, @s^.cur_file_info, @s^.cur_file_info_internal, nil, 0, nil, 0, nil, 0);
s^.current_file_ok := (err = UNZ_OK);
unzGoToFirstFile := err;
end;
{ Set the current file of the zipfile to the next file.
return UNZ_OK if there is no problem
return UNZ_END_OF_LIST_OF_FILE if the actual file was the latest. }
function unzGoToNextFile(afile: unzFile): longint; { ZEXPORT }
var
s: unz_s_ptr;
err: longint;
begin
if (afile = nil) then
begin
unzGoToNextFile := UNZ_PARAMERROR;
exit;
end;
s := unz_s_ptr(afile);
if not s^.current_file_ok then
begin
unzGoToNextFile := UNZ_END_OF_LIST_OF_FILE;
exit;
end;
if (s^.num_file + 1 = s^.gi.number_entry) then
begin
unzGoToNextFile := UNZ_END_OF_LIST_OF_FILE;
exit;
end;
Inc(s^.pos_in_central_dir,
SIZECENTRALDIRITEM + s^.cur_file_info.size_filename +
s^.cur_file_info.size_file_extra + s^.cur_file_info.size_file_comment);
Inc(s^.num_file);
err := unzlocal_GetCurrentFileInfoInternal(afile, @s^.cur_file_info, @s^.cur_file_info_internal, nil, 0, nil, 0, nil, 0);
s^.current_file_ok := (err = UNZ_OK);
unzGoToNextFile := err;
end;
{ Try locate the file szFileName in the zipfile.
For the iCaseSensitivity signification, see unzStringFileNameCompare
return value :
UNZ_OK if the file is found. It becomes the current file.
UNZ_END_OF_LIST_OF_FILE if the file is not found }
function unzLocateFile(afile: unzFile; const szFileName: PChar; iCaseSensitivity: longint): longint; { ZEXPORT }
var
s: unz_s_ptr;
err: longint;
num_fileSaved: longint;
pos_in_central_dirSaved: longint;
var
szCurrentFileName: array[0..UNZ_MAXFILENAMEINZIP + 1 - 1] of char;
begin
if (afile = nil) then
begin
unzLocateFile := UNZ_PARAMERROR;
exit;
end;
if (strlen(szFileName) >= UNZ_MAXFILENAMEINZIP) then
begin
unzLocateFile := UNZ_PARAMERROR;
exit;
end;
s := unz_s_ptr(afile);
if (not s^.current_file_ok) then
begin
unzLocateFile := UNZ_END_OF_LIST_OF_FILE;
exit;
end;
num_fileSaved := s^.num_file;
pos_in_central_dirSaved := s^.pos_in_central_dir;
err := unzGoToFirstFile(afile);
while (err = UNZ_OK) do
begin
unzGetCurrentFileInfo(afile, nil,
szCurrentFileName, sizeof(szCurrentFileName) - 1, nil, 0, nil, 0);
if (unzStringFileNameCompare(szCurrentFileName,
szFileName, iCaseSensitivity) = 0) then
begin
unzLocateFile := UNZ_OK;
exit;
end;
err := unzGoToNextFile(afile);
end;
s^.num_file := num_fileSaved;
s^.pos_in_central_dir := pos_in_central_dirSaved;
unzLocateFile := err;
end;
{ Read the local header of the current zipfile
Check the coherency of the local header and info in the end of central
directory about this file
store in *piSizeVar the size of extra info in local header
(filename and size of extra field data) }
function unzlocal_CheckCurrentFileCoherencyHeader(s: unz_s_ptr; var piSizeVar: longint; var poffset_local_extrafield: longint; var psize_local_extrafield: integer): longint;
var
uMagic, uData, uFlags: longint;
size_filename: longint;
size_extra_field: longint;
err: longint;
begin
err := UNZ_OK;
piSizeVar := 0;
poffset_local_extrafield := 0;
psize_local_extrafield := 0;
if (fseek(s^.afile, s^.cur_file_info_internal.offset_curfile +
s^.byte_before_the_zipfile, SEEK_SET) <> 0) then
begin
unzlocal_CheckCurrentFileCoherencyHeader := UNZ_ERRNO;
exit;
end;
if (err = UNZ_OK) then
if (unzlocal_getLong(s^.afile, uMagic) <> UNZ_OK) then
err := UNZ_ERRNO
else
if (uMagic <> $04034b50) then
err := UNZ_BADZIPFILE;
if (unzlocal_getShort(s^.afile, uData) <> UNZ_OK) then
err := UNZ_ERRNO;
{
else
if ((err=UNZ_OK) and (uData<>s^.cur_file_info.wVersion)) then
err := UNZ_BADZIPFILE;
}
if (unzlocal_getShort(s^.afile, uFlags) <> UNZ_OK) then
err := UNZ_ERRNO;
if (unzlocal_getShort(s^.afile, uData) <> UNZ_OK) then
err := UNZ_ERRNO
else
if ((err = UNZ_OK) and (uData <> s^.cur_file_info.compression_method)) then
err := UNZ_BADZIPFILE;
if ((err = UNZ_OK) and (s^.cur_file_info.compression_method <> 0) and
(s^.cur_file_info.compression_method <> Z_DEFLATED)) then
err := UNZ_BADZIPFILE;
if (unzlocal_getLong(s^.afile, uData) <> UNZ_OK) then { date/time }
err := UNZ_ERRNO;
if (unzlocal_getLong(s^.afile, uData) <> UNZ_OK) then { crc }
err := UNZ_ERRNO
else
if ((err = UNZ_OK) and (uData <> s^.cur_file_info.crc) and
((uFlags and 8) = 0)) then
err := UNZ_BADZIPFILE;
if (unzlocal_getLong(s^.afile, uData) <> UNZ_OK) then { size compr }
err := UNZ_ERRNO
else
if ((err = UNZ_OK) and (uData <> s^.cur_file_info.compressed_size) and
((uFlags and 8) = 0)) then
err := UNZ_BADZIPFILE;
if (unzlocal_getLong(s^.afile, uData) <> UNZ_OK) then { size uncompr }
err := UNZ_ERRNO
else
if ((err = UNZ_OK) and (uData <> s^.cur_file_info.uncompressed_size) and
((uFlags and 8) = 0)) then
err := UNZ_BADZIPFILE;
if (unzlocal_getShort(s^.afile, size_filename) <> UNZ_OK) then
err := UNZ_ERRNO
else
if ((err = UNZ_OK) and (size_filename <> s^.cur_file_info.size_filename)) then
err := UNZ_BADZIPFILE;
Inc(piSizeVar, integer(size_filename));
if (unzlocal_getShort(s^.afile, size_extra_field) <> UNZ_OK) then
err := UNZ_ERRNO;
poffset_local_extrafield := s^.cur_file_info_internal.offset_curfile +
SIZEZIPLOCALHEADER + size_filename;
psize_local_extrafield := integer(size_extra_field);
Inc(piSizeVar, integer(size_extra_field));
unzlocal_CheckCurrentFileCoherencyHeader := err;
end;
{ Open for reading data the current file in the zipfile.
If there is no error, the return value is UNZ_OK. }
function unzOpenCurrentFile(afile: unzFile): longint; { ZEXPORT }
var
err: longint;
Store: boolean;
iSizeVar: longint;
s: unz_s_ptr;
pfile_in_zip_read_info: file_in_zip_read_info_s_ptr;
offset_local_extrafield: longint; { offset of the local extra field }
size_local_extrafield: smallint; { size of the local extra field }
begin
err := UNZ_OK;
if (afile = nil) then
begin
unzOpenCurrentFile := UNZ_PARAMERROR;
exit;
end;
s := unz_s_ptr(afile);
if not s^.current_file_ok then
begin
unzOpenCurrentFile := UNZ_PARAMERROR;
exit;
end;
if (s^.pfile_in_zip_read <> nil) then
unzCloseCurrentFile(afile);
if (unzlocal_CheckCurrentFileCoherencyHeader(s, iSizeVar,
offset_local_extrafield, size_local_extrafield) <> UNZ_OK) then
begin
unzOpenCurrentFile := UNZ_BADZIPFILE;
exit;
end;
pfile_in_zip_read_info := file_in_zip_read_info_s_ptr(
AllocMem(sizeof(file_in_zip_read_info_s)));
if (pfile_in_zip_read_info = nil) then
begin
unzOpenCurrentFile := UNZ_INTERNALERROR;
exit;
end;
pfile_in_zip_read_info^.read_buffer := PChar(AllocMem(UNZ_BUFSIZE));
pfile_in_zip_read_info^.offset_local_extrafield := offset_local_extrafield;
pfile_in_zip_read_info^.size_local_extrafield := size_local_extrafield;
pfile_in_zip_read_info^.pos_local_extrafield := 0;
if (pfile_in_zip_read_info^.read_buffer = nil) then
begin
FreeMem(pfile_in_zip_read_info);
unzOpenCurrentFile := UNZ_INTERNALERROR;
exit;
end;
pfile_in_zip_read_info^.stream_initialised := False;
if ((s^.cur_file_info.compression_method <> 0) and
(s^.cur_file_info.compression_method <> Z_DEFLATED)) then
err := UNZ_BADZIPFILE;
Store := s^.cur_file_info.compression_method = 0;
pfile_in_zip_read_info^.crc32_wait := s^.cur_file_info.crc;
pfile_in_zip_read_info^.crc32 := 0;
pfile_in_zip_read_info^.compression_method := s^.cur_file_info.compression_method;
pfile_in_zip_read_info^.afile := s^.afile;
pfile_in_zip_read_info^.byte_before_the_zipfile := s^.byte_before_the_zipfile;
pfile_in_zip_read_info^.stream.total_out := 0;
if (not Store) then
begin
err := inflateInit2(pfile_in_zip_read_info^.stream, -MAX_WBITS);
if (err = Z_OK) then
pfile_in_zip_read_info^.stream_initialised := True;
{ windowBits is passed < 0 to tell that there is no zlib header.
Note that in this case inflate *requires* an extra "dummy" byte
after the compressed stream in order to complete decompression and
return Z_STREAM_END.
In unzip, i don't wait absolutely Z_STREAM_END because I known the
size of both compressed and uncompressed data }
end;
pfile_in_zip_read_info^.rest_read_compressed := s^.cur_file_info.compressed_size;
pfile_in_zip_read_info^.rest_read_uncompressed := s^.cur_file_info.uncompressed_size;
pfile_in_zip_read_info^.pos_in_zipfile :=
s^.cur_file_info_internal.offset_curfile + SIZEZIPLOCALHEADER + iSizeVar;
pfile_in_zip_read_info^.stream.avail_in := 0;
s^.pfile_in_zip_read := pfile_in_zip_read_info;
unzOpenCurrentFile := UNZ_OK;
end;
{ Read bytes from the current file (opened by unzOpenCurrentFile)
buf contain buffer where data must be copied
len the size of buf.
return the number of byte copied if somes bytes are copied
return 0 if the end of file was reached
return <0 with error code if there is an error
(UNZ_ERRNO for IO error, or zLib error for uncompress error) }
function unzReadCurrentFile(afile: unzFile; buf: pointer; len: cardinal): longint; { ZEXPORT }
var
err: longint;
iRead: Longint;
s: unz_s_ptr;
pfile_in_zip_read_info: file_in_zip_read_info_s_ptr;
var
uReadThis: longint;
var
uDoCopy, i: longint;
var
uTotalOutBefore, uTotalOutAfter: longint;
bufBefore: pbyte;
uOutThis: longint;
flush: longint;
begin
err := UNZ_OK;
iRead := 0;
if (afile = nil) then
begin
unzReadCurrentFile := UNZ_PARAMERROR;
exit;
end;
s := unz_s_ptr(afile);
pfile_in_zip_read_info := s^.pfile_in_zip_read;
if (pfile_in_zip_read_info = nil) then
begin
unzReadCurrentFile := UNZ_PARAMERROR;
exit;
end;
if ((pfile_in_zip_read_info^.read_buffer = nil)) then
begin
unzReadCurrentFile := UNZ_END_OF_LIST_OF_FILE;
exit;
end;
if (len = 0) then
begin
unzReadCurrentFile := 0;
exit;
end;
pfile_in_zip_read_info^.stream.next_out := pbyte(buf);
pfile_in_zip_read_info^.stream.avail_out := len;
if (len > pfile_in_zip_read_info^.rest_read_uncompressed) then
pfile_in_zip_read_info^.stream.avail_out :=
pfile_in_zip_read_info^.rest_read_uncompressed;
while (pfile_in_zip_read_info^.stream.avail_out > 0) do
begin
if ((pfile_in_zip_read_info^.stream.avail_in = 0) and
(pfile_in_zip_read_info^.rest_read_compressed > 0)) then
begin
uReadThis := UNZ_BUFSIZE;
if (pfile_in_zip_read_info^.rest_read_compressed < uReadThis) then
uReadThis := pfile_in_zip_read_info^.rest_read_compressed;
if (uReadThis = 0) then
begin
unzReadCurrentFile := UNZ_EOF;
exit;
end;
if (fseek(pfile_in_zip_read_info^.afile,
pfile_in_zip_read_info^.pos_in_zipfile +
pfile_in_zip_read_info^.byte_before_the_zipfile, SEEK_SET) <> 0) then
begin
unzReadCurrentFile := UNZ_ERRNO;
exit;
end;
if fread(pfile_in_zip_read_info^.read_buffer, uReadThis, 1,
pfile_in_zip_read_info^.afile) <> 1 then
begin
unzReadCurrentFile := UNZ_ERRNO;
exit;
end;
Inc(pfile_in_zip_read_info^.pos_in_zipfile, uReadThis);
Dec(pfile_in_zip_read_info^.rest_read_compressed, uReadThis);
pfile_in_zip_read_info^.stream.next_in :=
pbyte(pfile_in_zip_read_info^.read_buffer);
pfile_in_zip_read_info^.stream.avail_in := uReadThis;
end;
if (pfile_in_zip_read_info^.compression_method = 0) then
begin
if (pfile_in_zip_read_info^.stream.avail_out <
pfile_in_zip_read_info^.stream.avail_in) then
uDoCopy := pfile_in_zip_read_info^.stream.avail_out
else
uDoCopy := pfile_in_zip_read_info^.stream.avail_in;
for i := 0 to uDoCopy - 1 do
Pbytearray(pfile_in_zip_read_info^.stream.next_out)^[i] :=
Pbytearray(pfile_in_zip_read_info^.stream.next_in)^[i];
pfile_in_zip_read_info^.crc32 := crc32(pfile_in_zip_read_info^.crc32,
pfile_in_zip_read_info^.stream.next_out, uDoCopy);
Dec(pfile_in_zip_read_info^.rest_read_uncompressed, uDoCopy);
Dec(pfile_in_zip_read_info^.stream.avail_in, uDoCopy);
Dec(pfile_in_zip_read_info^.stream.avail_out, uDoCopy);
Inc(pfile_in_zip_read_info^.stream.next_out, uDoCopy);
Inc(pfile_in_zip_read_info^.stream.next_in, uDoCopy);
Inc(pfile_in_zip_read_info^.stream.total_out, uDoCopy);
Inc(iRead, uDoCopy);
end
else
begin
flush := Z_SYNC_FLUSH;
uTotalOutBefore := pfile_in_zip_read_info^.stream.total_out;
bufBefore := pfile_in_zip_read_info^.stream.next_out;
{
if ((pfile_in_zip_read_info^.rest_read_uncompressed =
pfile_in_zip_read_info^.stream.avail_out) and
(pfile_in_zip_read_info^.rest_read_compressed = 0)) then
flush := Z_FINISH;
}
err := inflate(pfile_in_zip_read_info^.stream, flush);
uTotalOutAfter := pfile_in_zip_read_info^.stream.total_out;
uOutThis := uTotalOutAfter - uTotalOutBefore;
pfile_in_zip_read_info^.crc32 :=
crc32(pfile_in_zip_read_info^.crc32, bufBefore, uOutThis);
Dec(pfile_in_zip_read_info^.rest_read_uncompressed, uOutThis);
Inc(iRead, uTotalOutAfter - uTotalOutBefore);
if (err = Z_STREAM_END) then
begin
if iRead = 0 then
unzReadCurrentFile := UNZ_EOF
else
unzReadCurrentFile := iRead;
exit;
end;
if (err <> Z_OK) then
break;
end;
end; { while }
if (err = Z_OK) then
begin
unzReadCurrentFile := iRead;
exit;
end;
unzReadCurrentFile := err;
end;
{ Give the current position in uncompressed data }
function unztell(afile: unzFile): z_off_t; { ZEXPORT }
var
s: unz_s_ptr;
pfile_in_zip_read_info: file_in_zip_read_info_s_ptr;
begin
if (afile = nil) then
begin
unztell := UNZ_PARAMERROR;
exit;
end;
s := unz_s_ptr(afile);
pfile_in_zip_read_info := s^.pfile_in_zip_read;
if (pfile_in_zip_read_info = nil) then
begin
unztell := UNZ_PARAMERROR;
exit;
end;
unztell := z_off_t(pfile_in_zip_read_info^.stream.total_out);
end;
{ return 1 (TRUE) if the end of file was reached, 0 elsewhere }
function unzeof(afile: unzFile): longint;
var
s: unz_s_ptr;
pfile_in_zip_read_info: file_in_zip_read_info_s_ptr;
begin
if (afile = nil) then
begin
unzeof := UNZ_PARAMERROR;
exit;
end;
s := unz_s_ptr(afile);
pfile_in_zip_read_info := s^.pfile_in_zip_read;
if (pfile_in_zip_read_info = nil) then
begin
unzeof := UNZ_PARAMERROR;
exit;
end;
if (pfile_in_zip_read_info^.rest_read_uncompressed = 0) then
unzeof := 1
else
unzeof := 0;
end;
{ Read extra field from the current file (opened by unzOpenCurrentFile)
This is the local-header version of the extra field (sometimes, there is
more info in the local-header version than in the central-header)
if buf=NIL, it return the size of the local extra field
if buf<>NIL, len is the size of the buffer, the extra header is copied in
buf.
the return value is the number of bytes copied in buf, or (if <0)
the error code }
function unzGetLocalExtrafield(afile: unzFile; buf: pointer; len: cardinal): longint;
var
s: unz_s_ptr;
pfile_in_zip_read_info: file_in_zip_read_info_s_ptr;
read_now: longint;
size_to_read: longint;
begin
if (afile = nil) then
begin
unzGetLocalExtrafield := UNZ_PARAMERROR;
exit;
end;
s := unz_s_ptr(afile);
pfile_in_zip_read_info := s^.pfile_in_zip_read;
if (pfile_in_zip_read_info = nil) then
begin
unzGetLocalExtrafield := UNZ_PARAMERROR;
exit;
end;
size_to_read := (pfile_in_zip_read_info^.size_local_extrafield -
pfile_in_zip_read_info^.pos_local_extrafield);
if (buf = nil) then
begin
unzGetLocalExtrafield := longint(size_to_read);
exit;
end;
if (len > size_to_read) then
read_now := size_to_read
else
read_now := len;
if (read_now = 0) then
begin
unzGetLocalExtrafield := 0;
exit;
end;
if (fseek(pfile_in_zip_read_info^.afile,
pfile_in_zip_read_info^.offset_local_extrafield +
pfile_in_zip_read_info^.pos_local_extrafield, SEEK_SET) <> 0) then
begin
unzGetLocalExtrafield := UNZ_ERRNO;
exit;
end;
if fread(buf, size_to_read, 1, pfile_in_zip_read_info^.afile) <> 1 then
begin
unzGetLocalExtrafield := UNZ_ERRNO;
exit;
end;
unzGetLocalExtrafield := longint(read_now);
end;
{ Close the file in zip opened with unzOpenCurrentFile
Return UNZ_CRCERROR if all the file was read but the CRC is not good }
function unzCloseCurrentFile(afile: unzFile): longint; { ZEXPORT }
var
err: longint;
s: unz_s_ptr;
pfile_in_zip_read_info: file_in_zip_read_info_s_ptr;
begin
err := UNZ_OK;
if (afile = nil) then
begin
unzCloseCurrentFile := UNZ_PARAMERROR;
exit;
end;
s := unz_s_ptr(afile);
pfile_in_zip_read_info := s^.pfile_in_zip_read;
if (pfile_in_zip_read_info = nil) then
begin
unzCloseCurrentFile := UNZ_PARAMERROR;
exit;
end;
if (pfile_in_zip_read_info^.rest_read_uncompressed = 0) then
if (pfile_in_zip_read_info^.crc32 <> pfile_in_zip_read_info^.crc32_wait) then
err := UNZ_CRCERROR;
FreeMem(pfile_in_zip_read_info^.read_buffer);
pfile_in_zip_read_info^.read_buffer := nil;
if (pfile_in_zip_read_info^.stream_initialised) then
inflateEnd(pfile_in_zip_read_info^.stream);
pfile_in_zip_read_info^.stream_initialised := False;
FreeMem(pfile_in_zip_read_info);
s^.pfile_in_zip_read := nil;
unzCloseCurrentFile := err;
end;
{ Get the global comment string of the ZipFile, in the szComment buffer.
uSizeBuf is the size of the szComment buffer.
return the number of byte copied or an error code <0 }
function unzGetGlobalComment(afile: unzFile; szComment: PChar; uSizeBuf: longint): longint; { ZEXPORT }
var
s: unz_s_ptr;
uReadThis: longint;
begin
if (afile = nil) then
begin
unzGetGlobalComment := UNZ_PARAMERROR;
exit;
end;
s := unz_s_ptr(afile);
uReadThis := uSizeBuf;
if (uReadThis > s^.gi.size_comment) then
uReadThis := s^.gi.size_comment;
if (fseek(s^.afile, s^.central_pos + 22, SEEK_SET) <> 0) then
begin
unzGetGlobalComment := UNZ_ERRNO;
exit;
end;
if (uReadThis > 0) then
begin
szComment^ := #0;
if fread(szComment, uReadThis, 1, s^.afile) <> 1 then
begin
unzGetGlobalComment := UNZ_ERRNO;
exit;
end;
end;
if ((szComment <> nil) and (uSizeBuf > s^.gi.size_comment)) then
(szComment +s^.gi.size_comment)^ := #0;
unzGetGlobalComment := longint(uReadThis);
end;
end.